19. Customer: Excuse me, I'm ready to order, but I don't see any menus here.

Waiter: Oh, we've switched to a QR code system. Just scan this code with your phone to view the menu and place your order online.

Customer: Oh, I didn't know that. _________.

 Waiter: No worries! Let me grab you a printed menu right away. You can still order with me at the table.
(A)I don't have my phone with me today.
(B)I prefer using digital menus over paper ones.
(C)I have the restaurant's app installed on my phone.
(D)I've already charged my phone to a full battery.